The Raman resonance happens when the electronic transition energy Eii meets either the incident laser energy or the scattering photon energy, which leads to the fact that for a single tube, then incident laser energy for RBM resonance doesn’t lie at Eii, but somewhere between Eii and Eii+-Eph, with Eph the phonon mode energy. Due to the large GM phonon energy compared to the RBM one, the RBM and GM for a single tube tend not to share the same resonance condition and a GM profile at a certain incident energy tends to contain unneglectable contributions of tubes with several chiralities even when one of them is in resonance.